
1) Absolutely essential 2) Anything indispensable 3) Basic 4) Called for 5) Compulsory 6) Critical 7) Crucial 8) Essential 9) Essential, indispensable 10) French word used in English 11) Important 12) Indispensable 13) Mandatory 14) Needed 15) Needful 16) Not an option 17) Not optional 18) Obligatory
Found on
https://www.crosswordclues.com/clue/necessary

1) Compulsory 2) Crucial 3) Desideratum 4) Essential 5) Indispensable 6) Inescapable 7) Inevitable 8) Integral 9) Justified 10) Need be 11) Needed 12) Needful 13) Obligatory 14) Required 15) Requisite 16) Vital 17) Warranted
Found on
https://www.crosswordclues.com/clue/necessary

That which must be, or cannot not be, as opposed to contingent.
Found on
http://catholicism.org/phil-glossary.html

adj., adv. 1) essen- tial. 2) less forcefully, it can mean convenient, useful or making good sense.
Found on
http://dictionary.law.com/Default.xhtml?selected=1309

• (a.) Impossible to be otherwise, or to be dispensed with, without preventing the attainment of a desired result; indispensable; requiste; essential. • (a.) Acting from necessity or compulsion; involuntary; -- opposed to free; as, whether man is a necessary or a free agent is a question much discussed. • (n.) A thing that is necessa...
Found on
http://thinkexist.com/dictionary/meaning/necessary/

1. Such as must be; impossible to be otherwise; not to be avoided; inevitable. 'Death, a necessary end, Will come when it will come.' (Shak) ... 2. Impossible to be otherwise, or to be dispensed with, without preventing the attainment of a desired result; indispensable; requiste; essential. ''T is necessary he should die.' 'A certain kind of temper...
Found on
http://www.encyclo.co.uk/local/20973

adj.Indespensable, extremely essential, compulsory, inevitable.
Found on
http://www.encyclo.co.uk/local/21213
Nec'es·sa·ry adjective [ Latin
necessarius , from
necesse unavoidable, necessary; of uncertain origin: confer French
nécessaire .]
1. Such as must be; impossible to be otherwise; not to be avoided; inevitable. « Death, a
necessary end, Will come when it wil...
Found on
http://www.encyclo.co.uk/webster/N/9

[
adj] - absolutely essential 2. [adj] - unavoidably determined by prior circumstances
Found on
http://www.webdictionary.co.uk/definition.php?query=necessary
adjective unavoidably determined by prior circumstances; `the necessary consequences of one`s actions`
Found on
https://www.encyclo.co.uk/local/20974

According to distinctions of modality (q. v.), a proposition is necessary if its truth is certifiable on a priori grounds, or on purely logical grounds. Necessity is thus, as it were a stronger kind of truth, to be distinguished from the contingent truth of a proposition which might have been otherwise. (As thus described, the notion is of course ....
Found on
https://www.encyclo.co.uk/local/21203
No exact match found.